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The visible cone is a supersonic diffuser with a requirement for low loss in total pressure, and the rear, streamlined part, together with the internal surface profile of the duct, forms the subsonic diffuser, also with a requirement for low loss in total pressure as the air slows to the compressor entry Mach number.
An early US supersonic fighter, the F-100 Super Sabre, used such an intake. An unswept lip generate a shock wave, which is reflected multiple times in the inlet. The more reflections before the flow gets subsonic, the better pressure recovery. More advanced supersonic intakes, excluding pitots:
For as-cataloged diffuser performance, a straight section of duct needs serve a diffuser. An elbow, or kinked flex duct, just before a diffuser often leads to poor air distribution and increased noise. Diffusers can be as a shape of round, rectangular, or can be as linear slot diffusers (LSDs).
The L-159 ALCA is designed for the principal role of light combat aircraft (single-seat L-159A variant) or light attack jet and advanced/lead-in fighter trainer (two-seat L-159B and T variants). [ 15 ] [ 16 ] Design of the L-159 was derived from the L-39/59 in terms of aerodynamic configuration but a number of changes were made to improve its ...
Ejector refers to the pumping action of the very hot, high speed, engine exhaust entraining (ejecting) a surrounding airflow which, together with the internal geometry of the secondary, or diverging, nozzle controls the expansion of the engine exhaust. At subsonic speeds, the airflow constricts the exhaust to a convergent shape.
The jet’s engine creates 43,000 pounds of thrust and it can fly up to 1,200 mph.
The L-15A subsonic advanced jet trainer is powered by the Ivchenko-Progress AI-222-25 [2] and has seven weapon hardpoints. [10] The supersonic advanced fighter trainer variant is powered by the afterburning AI-222K-25. [2] According to a Ukrainian source, 25% of the aircraft is composed of composite materials and its service life is 10,000 ...
There's a controversy brewing involving the nation's newest military branch over the potential of moving Air National Guard units into the U.S. Space Force.